enclosed text that's supposed to be monospace into a ```text``` block.

README.md

@@ -3556,7 +3556,11 @@ fn main() {
 }
 ```
 
-The message is: "thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src\main.rs:14:9".
+The message is:
+
+```text
+"thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src\main.rs:14:9"
+```
 
 But we don't need to use `.unwrap()`. We can use a `match`. Then we can print the value we have `Some`, and not touch it if we have `None`. For example: